83 lines
2.1 KiB
Markdown
83 lines
2.1 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_CRLFILE
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_PROXY_CRLFILE (3)
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- CURLOPT_SSL_VERIFYHOST (3)
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- CURLOPT_SSL_VERIFYPEER (3)
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---
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# NAME
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CURLOPT_CRLFILE - Certificate Revocation List file
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CRLFILE, char *file);
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~~~
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# DESCRIPTION
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Pass a char pointer to a null-terminated string naming a *file* with the
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concatenation of CRL (in PEM format) to use in the certificate validation that
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occurs during the SSL exchange.
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When curl is built to use GnuTLS, there is no way to influence the use of CRL
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passed to help in the verification process.
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When libcurl is built with OpenSSL support, X509_V_FLAG_CRL_CHECK and
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X509_V_FLAG_CRL_CHECK_ALL are both set, requiring CRL check against all the
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elements of the certificate chain if a CRL file is passed. Also note that
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CURLOPT_CRLFILE(3) implies **CURLSSLOPT_NO_PARTIALCHAIN** (see
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CURLOPT_SSL_OPTIONS(3)) since curl 7.71.0 due to an OpenSSL bug.
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This option makes sense only when used in combination with the
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CURLOPT_SSL_VERIFYPEER(3) option.
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A specific error code (*CURLE_SSL_CRL_BADFILE*) is defined with the option. It
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is returned when the SSL exchange fails because the CRL file cannot be
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loaded. A failure in certificate verification due to a revocation information
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found in the CRL does not trigger this specific error.
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The application does not have to keep the string around after setting this
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option.
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# DEFAULT
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NULL
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# PROTOCOLS
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All TLS-based protocols
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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curl_easy_setopt(curl, CURLOPT_CRLFILE, "/etc/certs/crl.pem");
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.19.0
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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